CVE-2026-12329 | Memory safety bug fixed in Thunderbird ESR 140.12. This vuln… | CVSS 5.3 MEDIUM

Description

Memory safety bug fixed in Thunderbird ESR 140.12. This vulnerability was fixed in Firefox ESR 140.12 and Thunderbird 140.12.

CVE ID: CVE-2026-12329
State: PUBLISHED
Assigner: mozilla
Reserved: 2026-06-15 15:08 UTC
Published: 2026-06-16 11:53 UTC
Last updated: 2026-06-16 16:08 UTC
Primary CWE: CWE-119
CWE-119 Improper Restriction of Operations within the Bounds…
Vendor / Product: Mozilla / Firefox
Sources: cve.org · NVD

5.3 MEDIUM CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

SSVC — CISA Coordinator

Affected products (2)

Vendor	Product	Platform	Versions
Mozilla	Firefox	—	140.12 ≤ *
Mozilla	Thunderbird	—	140.12 ≤ *

Weakness (CWE)

CWE	Source	Description
CWE-119	adp	CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-416	adp	CWE-416 Use After Free
CWE-476	adp	CWE-476 NULL Pointer Dereference

CVSS scores (1)

Score	Severity	Version	Source	Vector
5.3	MEDIUM	3.1	adp	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References (3)